Exfm started life as a plugin for the Chrome web browser, helping people to play music embedded within websites and blogs. It has since pivoted into a music discovery service, which now has its own iPhone app. Users can play new songs and their own collections, see what friends have been recommending, and scrobble their listening to Last.fm.

Mozilla has released Firefox 5 for Android smartphones, including some of the new features from the just-released desktop version of the browser. That includes more control over data and privacy, and promised faster page loading.

Gameloft's BackStab action-adventure started life as an exclusive for Sony Ericsson's Xperia Play phone, and has now made the leap to iPhone and iPad. The 3D action-adventure offers big-budget visuals and piratical thrills.

There's a big buzz around games developer kode80's 1-bit Ninja, which has been released for iPhone today. The retro 2D jump-and-run game can be dragged into 3D to find secret passages, with a chiptune soundtrack to tap your feet to along the way.

BlackBook claims to be the "quickest, easiest and best looking Twitter client for BlackBerry PlayBook" – not a hugely crowded market at the time of writing. It supports multiple accounts and the usual tweeting features.

Publisher Telltale has released the second Monkey Island Tales game for iPad, and for good measure has also released Monkey Island Tales 3 HD, Monkey Island Tales 4 HD and Monkey Island Tales 5 HD on the same day.

An iOS game for everyone who's ever thought "Sonic the Hedgehog would be much better if he was inside a car pretending to be in Mario Kart". The game stars Sonic and nine other Sega characters, with the obligatory mix of missiles and traps.

Touting the "fascinating world of Lufthansa" in the first line of the App Store listing may be pushing it a bit, but the airline's app certainly has plenty of features. A world map to explore routes, tourist information on more than 70 destination cities, weather forecasts and the ability to check in and manage air miles are all included.

Another day, another social location app. Banjo is out for iPhone and Android, and aims to connect users with people around them, pulling in people from Facebook, Twitter and other social services with geotagged updates.

Orange has released its charitable Do Some Good app for Nokia devices on the Ovi Store, with suggestions of five-minute activities and music rewards for people who spend four hours doing several of them.

Airbus is promoting its vision for air travel in the year 2050 with a new iPhone and iPad app subtitled Concept Cabin. Expect a virtual tour of the futuristic plane's 'intelligent, transparent wall membrane' and other features.